GRAFTEC
Gaskets
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Flexible Graphite
Graphite is resistant in high temperatures to 450°C (850°F) in hot air, 700°C (1300°F) in steam environment.
Concentric Corrugated
Metal Core
Minimizes extrusions
Extra strength, particularly in narrow cross section
Strategy
No leaks
Extra strength
Encapsulated with Flexible Graphite
Graphite is resistant in high temperatures to 450°C (850°F) in hot air, 700°C (1300°F) in steam environment.
Resistant to low temperature of -200°C (-328°F)
Rapid heat transfer
No binders—eliminates potential fluid contamination from binder residue
Chemically bonded with polyester layer in a proprietary process that assures that the graphite will adapt to ultrafine surface irregularities
Concentric Corrugated Metal Core
Minimizes extrusions
Pushes graphite into the leakpaths
Reduces gasket damage in handling and installation
Extra strength, particularly in narrow cross section
Increases springiness to handle thermal cycling
Greatly increases sealability under low bolt loads
Different metals available to match flange metallurgy, temperature or chemical resistance
1.0 General
This gasket may be substituted for compressed asbestos or spiral wound gaskets in raised face weld neck or slip-on ASME/ANSI B16.5 class 150,300 & 600 carbon or alloy steel piping joints. Joints with these gaskets may be assembled with normal plant care.
2.1 Physical and Material Characteristics
Corrugated metal encapsulated with chemically bonded flexible graphite.
Nominal thickness: 1/16 inch.
Graphite layers: 2 layers, each flexible graphite nominal .020 inch thick.
Metal inset: Nominal .024 inch thick austinetic stainless steel with corrugations. Other types of metal are available.
Gasket Dimensions: manufactured to all Internationally Accepted Standards and can accomodate special sizes or configurations.
2.2 Joint Assembly Characteristics
Gasket shall achieve tightness and be suitable for joint assembly using the same manual procedures, skills, care and tools as is appropriate for compressed asbestos sheet gaskets. Bolt load control such as torque settings is optional. Torque wrench not required.
3.0 Fire Resistance: Simulated Tightness Test (FITT)
M&P Sealing Company, certifies the result of two tests, conducted in accordance with the Pressure Vessel Research Council FITT procedure 1.3 (Ref.1) on NPS 4 test gaskets exposed to a 20 minute heat-up plus 15 minute soak @ 1200°F, and the following:
Required post exposure Minimum Tightness: Tpmin > 32 (Helium)
Typical post exposure Minimum Tightness: Tpmin = 2000 (Helium)
4.0 Room Temperature Tightness (Helium Media ROTT)
M&P Sealing Company certifies the result of two or more tests on 4 7/8″ ID by 5 7/8″ OD gaskets, conducted in accordance with the Pressure Vessel Research Council developed Room Temperature Tightness Test (ROTT) [Ref.2] procedure and the following:
| Requirement | Gb | a | Gs | S100 | S1,000 (1.2) |
| Maximum: | 1,300 | 0.273 | 9 | 3,180 | 5,630 |
| Typical: | 922 | 0.248 | 5 | 2,889 | 5,114 |
Crush Qualification Test
M&P Sealing Company certifies the results of a crush test on the Graftec Gasket that indicates the tightness parameter, Tp: and the gasket deflection, Dg (in.) with a gasket stress, Sg (psi) up to 40,000psi and internal pressure of 800psi (Helium). The test demonstrates adequate resistance to crushing by excessive bolt load.
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